Overview and classification of industrial wastewater

Overview of industrial wastewater

Industrial waste water refers to waste water, sewage and waste liquid produced in the process of industrial production, which contain industrial production materials, intermediate products and products that are lost with water, and pollutants generated in the production process. Industrial wastewater is usually divided into the following three types:

The first is classified according to the chemical properties of the main pollutants contained in industrial wastewater. The inorganic wastewater mainly contains inorganic pollutants and the organic wastewater mainly contains organic pollutants. For example, electroplating wastewater and wastewater from mineral processing are inorganic wastewater; wastewater from food or petroleum processing is organic wastewater.

The second is classified according to the products and processing objects of industrial enterprises, such as metallurgical wastewater, papermaking wastewater, coking gas wastewater, metal pickling wastewater, chemical fertilizer wastewater, textile printing and dyeing wastewater, dye wastewater, tanning wastewater, pesticide wastewater, power station wastewater Wait.

The third is classified according to the main components of pollutants in wastewater, such as acid wastewater, alkaline wastewater, cyanide wastewater, chromium wastewater, cadmium wastewater, mercury wastewater, phenol wastewater, aldehyde wastewater, and oily wastewater , Sulfur-containing wastewater, organic phosphorus wastewater and radioactive wastewater, etc.

Classification of wastewater treatment

According to the principle of wastewater treatment:

  • Physical method: Use physical action to separate pollutants in suspended state from wastewater, and the nature of pollutants does not change during the treatment process.
  • Chemical method, physicochemical method: A method that uses a certain chemical reaction to change the nature or form of pollutants in wastewater and remove them from the water.
  • Biochemical method (biological method): A method that uses the action of microorganisms to remove colloidal and dissolved organic matter in wastewater.

According to the degree of wastewater treatment:

  • Primary treatment (including pretreatment)
  • Secondary treatment (biological treatment)
  • Three-level processing (deep processing
Reverse Osmosis & Water Filtration Systems in Wastewater Treatment

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